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Imatest Documentation X-Rite ColorChecker (24-patch) IT8.7 Default values from GMB, BabelColor, or Danes Picta (a chart with the same geometry but different colors) or L*a*b*, xyY D50, or xyY D65 files in CSV format. Requires a reference file in IT8.7 format, available from the chart manufacturer, generally available on their websites. CMP DigitaL TargeT 003 Individually measured reference files are supplied with each target. X-Rite ColorChecker SG Stepchart (linear) Default values from GMB or user-supplied L*a*b*, xyY D50, or xyY D65 files in CSV format. Even density steps of 0.1, 0.15, 0.20, or 0.30 or an ASCII density reference file with one density value per line can be entered. The default is even density steps of 0.1. Except for the IT8.7 and CMP DT 003, reference files need to be in CSV (comma-separated file) format, which can be opened and edited in Excel. Color files (L*a*b*, xyY D50, and xyY D65) have three entries per line. The Multicharts window Here is an example of an L*a*b* file. The format is CSV (comma-separated variables). The format is the same for xyY files. Spaces are for visual clarity (readability) only. 55.261, -38.342,31.37 28.778, 14.179, -50.297 65.711, 18.13, 17.81 51.038, -28.631,-28.638 51.935, 49.986, -14.574 81.733, 4.039, 79.819 42.101, 53.378, 28.19 After the image file has been entered, the most recent Chart view is displayed. The 2D a*b* view (ideal and input values on the CIELAB a*b*) is shown below. 2D a*b* display of IT8 chart (CMYKRGB primaries) The main display image is on the upper left. Color differences are summarized below this image, except when the Probe is turned on (available for the pseudocolor and split color displays). The various ∆E* and ∆C* values are described in Gamutvision equations. A synthesized image of the chart is shown on the upper right. Available options are described below. The remainder of the right side is the control area. 310 of 451
Imatest Documentation The Zoom checkbox turns Zoom on and off. 3D plots can be rotated when Zoom is turned off. The four buttons to the right of Zoom control the display of the synthesized image on the upper-right. Ideal displays the ideal image with no gamut mapping. Colors will not be accurate for large gamut color spaces. Id>M displays the ideal image mapped from its native color space to sRGB, which is similar to typical monitor color spaces. Input displays the input image with no gamut mapping. In>M displays the input image mapped from its native color space to sRGB, which is similar to typical monitor color spaces. Image area The pale blue box is the image area. It includes the Read image file and Reload buttons, the Chart type dropdown menu (described above), entries for image properties, and color correction matrix functions . Reload reloads an image from a file or reacquires it from a device or video stream (depending on how the image was originally acquired). It is most valuable for versions of Imatest that can acquire images from devices or streams. IT8.7 chart Color space allows the input file color space to be selected: the color space is not automatically read into Multicharts; it must be entered manually. One of six color spaces can be selected (more may be added in the future). sRGB Adobe RGB (1998) Wide Gamut RGB The default space of Windows and the Internet. Limited color gamut based on typical CRT phosphors. Gamma = 2.2 (approximately), White point = 6500K (D65). Medium gamut, with stronger greens than sRGB. Often recommended for high quality printed output. Gamma = 2.2, White point = 6500K (D65). Extremely wide gamut with primaries on the spectral locus at 450, 525, and 700 microns. One of the color spaces supported by the Canon DPP RAW converter. 48-bit color files are recommended with wide gamut spaces: banding can be a problem with 24-bit color. Gamma = 2.2, White point = 5000K (D50). ProPhoto RGB Extremely wide gamut. Gamma = 1.8, White point = 5000K (D50). Apple RGB Small gamut. Used by Apple. Gamma = 1.8, White point = 6500K (D65). ColorMatch RGB Small gamut. Used by Apple. Gamma = 1.8, White point = 5000K (D50). Danny Pascale's A Review of RGB Color Spaces is recommended for readers interested in an in-depth explanation of color spaces. Ref is the reference source for the ideal chart values. The contents of the popup menu depends on the chart type. For the 24-patch ColorChecker and the ColorChecker SG you can select either standard chart reference values or you can read in values from data files (Imatest Master only). Values for the two ColorCheckers have been supplied courtesy of X-Rite. You can select between six image file color spaces: sRGB, Adobe RGB (1998), Wide Gamut RGB, ProPhoto RGB, Apple RGB, or ColorMatch. Danny Pascale/Babelcolor's page on the ColorChecker contains nearly everything you want to know about the chart. Ian Lyons has a nice description of IT8.7 charts. Correction matrix calculates the color correction matrix (Imatest Master only). After Correction matrix has been pressed it changes to Matrix calculated , highlighted with a pink background. The correction matrix cannot be recalculated until a property of the image changes (new image, color space, reference file, or color matrix setting). The Display input (or Corrected) dropdown menu, immediately to its left, is enabled. More details on using the color correction matrix can be found here. Display selection box and area 311 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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